Hydraulic control panel



HYDRAULIC CONTROL PANEL Filed Dec. 2i. 1945 5 Sheets-Sheet l 5. 7 r` l wBO ,E Lb 9, /l/Vv 1% u f 2 m m .Ml/r w Myw/ M ,///e, .m I

. u 7, u v D` I 7% /7 L w wm IN VEN TORS [7L/NDW B. 5mm/ww ma' 55m/H527L- Reim/HN Dec. i3, w49 D. B. GARDINER Erm. 2949393731 HYDRAULIC CONTROLPANEL Filed Dec. 2'1, 1945 5 Sheets-Sheet 2 f6 Sovf T i .1Q g 'f i IN VEN TORS .FuNc/wv 5. 5H/Fawn ma Esa/Wmv L, FEHDMHN -Dec. 13, 1949 D. B.csARDlN-ER Erm. 2,491,371

HYDRAULIC CONTROL PANEL y Filed Dec. 21, 1945 5 Sheets-Sheet 3HA/DEfRA/Hna L. @www /77' ran/wr D. GARDIINER ETAL. 294919373 HYDRAULICcoNTRorJl PANEL 1945 5 Sheets-Sheet 4 Filed Deo. 21

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INVENTURS EUA/WN B.. fw/@ ma? ,B5/wana l, @Hum/V RAPID RETURN FEEDFORWARD ZAQLS'E Dec. 13, 1949 D. B. GARDINER Erm.

HYDRAULIC CONTROL PANEL 5 Sheets-Sheet 5 Filed Dec. 21, 1945 D .l I umj] CLOSED STOP DIFF.

RAPID ADVANCE E C M V D A CENTER INVENTORS .Uu/mmf E. gnam/v5@ HNUBMNHRUL- Hann/ww 5f i /77 Tan/ver Patented Dec. 13, 1949 HYDRAULIC CONTROLPANEL Duncan B. Gardiner, and Bernard L. Readman,

Detroit, Mich., assilnors to Vickers Incorporated, Detroit, Mieli., acorporation of Michlgan Application December 21, 1945, Serial No.636,324

s claims'. l

This invention relates to power transmissions, particularly to those ofthe type comprising two or more fluid pressure energy translatingdevices, one of which may function as a pump and another as a fluidmotor.

The invention more particularly relates to hydraulic transmissionsystems for driving machine tools incorporating a iluid pump, reversibleiluid motor and a control panel containing the necessary valving forproducing rapid advance, feed and rapid return movements of the motorand also for stopping the same.

In the art of hydraulic transmission systems of this type, the use of apanel incorporating the necessary valving to control the movement of themotor has become quite common. However, it has been the practice to useentirely different panels containing entirely different porting.-Dassages and valving to -meet the requirements -of various types ofinstallations. Thus, a panel-incorporating an open-center type controlvalve, although suitable for some installations, would be entirelyinadequate for systems demanding the use of a closed-center type ofcontrol valve or the use of a differential type control valve. Forinstance, whereas a panel incorporating an opencenter type control valvewould be adaptable for use in a hydraulic transmission containing aconstant delivery pump and reversible uid motor for driving a singleload device, if another fluid motor was added to the transmission todrive an additional load device during periods of inactivity -of thefirst load device, an entirely ldifferent panel incorporating aclosed-center control valve would have to be substituted for the rstpanel.

It is therefore an object of this invention to provide a panel which maybe used to nt a variety of installation requirements siniply bysubstituting a control valve of one type for a control valve of anothertype all of which are mountable within the same valve bore of the panelwithout any other changes being made to the panel.

In particular, it is an object of this invention 2 ferently designedcontrol valves may be shiited in identically the same manner withinsaid'bore for controlling the ports and passages toy produce theaforementioned movements of the motor, one co'ntrol valve being of theopen-center type for unloading the pump to stop the motor. another beingof the closed-center type for blocking the flow of pressure fluid at thecontrol valve to stop the motor and the other being of the differentialtype to produce a differential rapid advance movement of the motor.

It is another object of this invention to provid a control panel for ahydraulic transmission sys tem and vfor the purposes such as statedabove which will be light in weight, compact and which willgive longlife and be easily convertible to suit the needs of differentinstallations.

It is still another object to provide a panel for a system and for thepurposes as above stated containing a longitudinal bore in which may beidentically mounted any one of three control valves of different typesshiftable completely within said bore, with identical means for shifting said control valves manually or mechanically from the front or therear of said panel, by -pres,- sure lluid applied at either end of saidcontrol valve, by solenoid means, or by a combination of any of theabove means.

Further objects and advantages of the present invention will be apparentfrom the followingl description, ref erence being had tothe accompanyingdrawings wherein a preferred form of the present invention is clearlyshown.

In the drawings:

. Figure 1 is a cross-sectional view'of a -panel embodying one form ofthe present invention taken on line I-l of Figure 4.

Figure 2 is a plan View of the panel.

Figure 3 is a front elevation of the panel.

Figure 4 is a bottom view of the panel.

Figure 5 is a rear elevation of the panel.

Figure 6 is a 'cross-sectional view taken on line 6--6 of Figure 3. j

Figure 7 is a diagrammatic view of a hydraulic circuit incorporating thepanel of Figures Il through 6 and showing a portion thereof in one ofits dillerent positions.

Figure 8 is a view corresponding to Figure 7 but illustrating the partsin a different position.

Figure 9 is a view corresponding to Figure 'I4 but showing the parts instill another position.

Figure 10 is a view corresponding to Figure 'I but showing the parts instill another position.

, Figure 11 is a diagrammatic view of a hydraulic circuit incorporatinganother form of panel and showing a portion thereof in one of itspositions.

Figure 12 is a view of a hydraulic circuit incorporating still anotherform of panel and showing a portion thereof in one of its positions.

Figure 13 is a sectional view taken along line I3-l3 of Figure 2.

Figure 14 is an end view of a portion of the panel.

Figure 15 is a side elevation of a portion of the panel.

Referring now to Figure 1, there is shown a cross-sectional view of aunitary control panel I8 comprised of a block I2 having a longitudinalmain valve bore I4 extending completely across said block. Bore I4 isprovided with a groove forming a pressure port I6 located between twogrooves forming motor ports I8 and 20. Spaced apart from port I8 is agroove forming a throttle port 22 and spaced apart from port 2u is agroove of much greater length forming a tank port 24. There is alsoshown shiftably mounted within bore I4, which is suitably closed at eachend thereof by plugs 26 and 28, a control valve 3U of the open-centertype i'or the purpose of controlling and directing the flow to and fromthe aforementioned ports. Pressure duid is admitted and emitted to andfrom. the panel I8 by means of external connection ports at the rear ofsaid panel shown in Figure 5.

Referring now to Figures 1 and 5, there is shown an external pressureport 32 which is con= nected to the internal pressure port I6 by meansof a lateral passage 34 extending from the left side of block I2 to apoint of intersection with a vertical passage 36 constructed from thetop of block I2 and which intersects pressure port I6 and a passage 38directly connected to external pressure port 32 and extending to passage34. The exterior terminus of passages 34 and 36 are suitably closed byplugs 39. Thus, pressure uid entering external pressure port 32 isconducted to internal pressure port I6 by means of passage 38, lateralpassage 34 and vertical passage 36. An external tank port 40 at the rearof panel I8 is connected directly to internal tank port 24 by means of apassage 42. Also at the rear of panel I is a pair of external motorports 44 and 46. As shown in Figure 3, motor port 44 is connected tointernal motor port I8 by means of a passage 48 connected directly toexternal port 44 which intersects a vertical passage 50 extending fromthe top of block I2 to a point of intersection with passage 48 and whichalso intersects port I8. The exterior terminus of passage 50 is closedby a suitable plug I. Thus, iluid entering external motor port 44 isconducted to internal motor port I8 by means of passages 48 and 50.

Motor port 46 is connected to internal motor port 20 by means of apassage 52 connected directly to port 46 which intersects a verticalpassage 54 extending from the bottom of block I2 to 'a point ofintersection with a lateral passage 56. Passage 56 extends from theright side of block l2 to a point of intersection with a verticalpassage 58 constructed from the top of block I2 and which intersectsport 2l)` Passages 54, 56 and 58 are closed exteriorly by plugs 59.Thus, uid entering external motor port 46 is conducted to motor port 20by means of passage 52, passage 54, passage 56 and passage 58.

There is shown in Figure 5 an external pilot valve port 60 which isdirectly connected to the left end of bore I4 by means of a passage 62and a similar external pilot valve port 64 which Is directly connectedto the right end of bore I4 by means of a passage 66. There is shown inFigure 1 a longitudinal stepped passage 68 constructed completely acrossblock I2. A vertical passage l0 and a vertical passage l2, both of whichare constructed from the top of block I2, intersect both bore I4 andpassage u8 at the left and right ends of said loore and passagerespectively. 'lne exterior terminus of passages 68, 'IU and l2 areclosed by suitable plugs 14 and, in addition, plugs l5 are inserted inpassages 'I0 and 'l2 to prevent uid in these passages lrom escapingthrough mounting holes 18 which register with said passages. Thesepassages permit the application of pressure uid to either end of thecontrol valve for hydraulic actuation thereof and permit the controlvalve to shift freely within its bore by providing an outlet fordischarging fluid from opposite ends of the bore when the valve isshifted.

If control valve 38 is to be hydraulically operated and pilot valvecontrolled, a plug 78 is inserted in passage 68 between passages 70 and72. If control valve 30 is to be operated other than hydraulically, plug'I8 is removed, a suitable plug is inserted in passage 62, and port 64is left unplugged to act as a drain port for proper shiiting of valve30.

Means are provided for regulating uid ow by mounting an adjustablethrottle 8u (Figure 6) in a stepped bore 82 extending completely throughblock IZ from front to rear, said bore being closed at the rear by asuitable plug 84 threaded into throttle 88. In order to maintain aconstantly uniform ow of Huid through throttle 80, a pressure-responsivecompensating valve 86 (Figure l) for maintaining a constant pressuredrop across throttle is mounted in a longitudinal bore 88 extendingcompletely across block I2, bore 88 being closed at both ends thereof bysuitable plugs 9D.

In order to connect compensating valve 86 and throttle 80 in seriesbetween external motor port 44 and throttle port 22, a vertical passage92 is constructed from the bottom of block I2 which intersects andcontinues through compensating valve bore 88 to bore 82 (Figure 1).Throttle 80 is so mounted in bore 82 that a throttling portion 94thereof (Figure 6) is in alignment with passage 92 and with a passage 96constructed from the left side of block I2 and also connected tothrottle bore 82. A passage 98 constructed from the back of block I2intersects a passage 96 and continues to a point of intersection with apassage |00 (Figure 4) which is constructed from the top of block I2 toa point of intersection with passage 98 and which also intersects port22. It should be notedat this point that passage 54 which is constructedfrom the bottom of block I2 and which extends to a point of intersectionwith passage 56 also intersects compensating valve bore 88 (Figure 3).Thus, if fluid 4entering external motor port 46 is blocked by controlvalve 30 at port 20, it may ow through port 46 to passage 52, frompassage 52 to passage 54 and compensating valve bore 88 and from saidbore to passage 92 (Figure l) whence it is conducted through throttle 80and thence by means of passages 96, 98 and |00 to port 22. In order tomake compensating Valve 86 truly responsive to the pressure drop acrossthrottle 80, compensating valve 86 is also connected to the tank port 24of bore I4. 'Referring now to Figure 5, this is accomplished by means ofa passage |02 constructed completely across block |2 and closed at bothends by suitable plugs |84, a. passage |06 constructed from the back ofblock 2 to compensating valve bore 88 and intersecting passage |02, anda vertical passage |08 construct-A ed from the bottom of block I2extending to a point of intersection with a passage ||0. Passage isconstructed from the front of block I2 to a point of intersection withpassage |08 and also intersects valve bore I4 at port 24 (Figure 1).

Referring now to Figure 1, compensating valve 86 is comprised mainly ofa piston 2 connected to which is a stem ||4 having lands ||6 and ||8.Stem ||4 is shiftable within a sleeve ||1 having ports adapted tocooperate with the passages connected to the compensating valve bore 88.Piston,||2 is shiftable within bore 88 and is responsive to pressure inchambers |20 and |2| to the right and left, respectively, of pistn ||2in bore 88. Sleeve ||1 contains a groove |22 which is intersected bypassage 54 and a passage |24 connected to said groove. Passage |24 iscontrolled in such a manner by landl l| I8, originally biased to openposition by a spring |26. that the flow of fluid therefrom throughanother passage |28 connected tol a groove |30 which is intersected bypassage 92 will be maintained uniformly constant. Land ||8 willpartially open and close-passage |24 to admit more or less fluid throughpassage |28 and groove |30 to passage 92 as determined by thedifferential pressure existing in chambers |20 and- |2| and acting onopposite sides of piston ||2. Pressure fluid is admitted to chamber |20to act against piston ||2 and is also able to act against the Referringto Figures 2 and 13, means are also provided for adjustingv the throttleportion 94 within bore 82 between passages 92 and 96 to very closetolerances of uid flow by connecting a splined shaft |50 by means of apin |52 to a small knob |54. The extreme end of the splined shaft |50revolves about a gear rack |56 formed in an arcuate slot |58 located incover plate |48 (Figure 13). Knob |54 is slipped from the side intoslots |60 (Figure 2) running completely across raised portion |36 ofdial |34 which prevents vertical movement of knob |54, and the splinedshaft |50 which is mounted in a bore |62 of raised portion |36 preventshorizontal movement thereof. The diameter of the knob |54 is preferablyslightly larger than the width of raised portion |36 for easy operationof the knob. It should be noted that the dial |34 may be rotated to givea coarse adjustment of the throttle or 'the knob |54 maybe rotated togive a fine adjustment of said throttle.

For the purpose of shifting control valve 30 other than hydraulicallyunder the control of an external pilot valve ,connected to the pilotvalve connection 60 and 64, means are provided for shifting the valve)at the front or rear of the panel I0 by having dogs attached to themotor or a machine tool contact a cam connected to a rotatable'shaftwhich is lever-connected to the valve 30. As shown in Figure 1, astepped bore |64 is constructed from the top of block |2 to a point ofintersection with the groove forming port bottom area of land ||8 bymeans4 of a drilled p pressure past throttle 80 in chamber |2|, tankport 24 is connected as aforementioned to said chamber by means ofpassages |06, |02, |88 and |0, passage |06 intersecting bore 88 at apoint to the left of piston I2.

Referring now to Figures 2, 6, and 13. throttle 80 is connected to adial |34 having a raised portion |36 by means of a bolt |38 threadedinto throttle 80, the connected end of said throttle fitting into a bore|40 of an extended portion |42 of said dial. The extended portion of thedial |34 is also provided with slots |41. A pin 43 driven throughthrottle 80 has end portions |44 inserted into the slots |4| and whichextend therefrom. The extreme ends |44 of the pin |43, which extend fromthe slots |4| are insertable through slots |45 of a hole |46 in a coverplate |48. The bolt |38 preventsY v the dial |34 lifting from thethrottle 80 while the pin |43, in cooperation with the slots 14|,provides a rotary driving connection between the dial |34 and thethrottle 80. When inserting the throttle into bore 82 through the hole|46 of cover plate |48, the portions |44 of pin |43 extending from theslots |4| are inserted through the slots |45 with the extended portionsfinally abutting va shoulder |49 of bore 82. By rotating the dial, whichcovers the hole |46 of cover plate |48', the complete throttle and dialassembly is held securely in place but is freely rotatable by reason ofthe extended portions |44 of pin |43 being located between cover plate|46 and shoulder |49 of bore 82. A sleeve |5| having a seal |53 ispress-fitted into the rear end of bore 82 and the plug 84 is threadedinto throttle 80 so as to completely close and seal said bore (Figure6).

24 of bore |4. Another bore |66 is constructed completely through block|2 from front to rear thereof between the top of said block and bore |4and which intersects bore |64. A shaft |68, shown in Figure 15, having acam |10 near its left end provided with tits |12, a recess |14 for asuitable seal |16 (Figure 6)., a transverse bore |18 and a groove isinserted from the front end of block I2 into bore |66 with bore |18 ofsaid shaft registering with the vertical bore |64 of block '|2.

A rod |82 having a flattened ball |84 at one end thereof is inserted bythe medium of bore |644 into and through bore |18 of shaft |68 with ball|84 resting in a bore |86 of proportionate area located in the right endof control valve 30. The rod |82 is provided at its end opposite theball |84 with a threaded bore |88 and slots |90 for the purpose ofthreading a set screw |92 into bore |88 and, because of slots |90therein, slightly expanding rod |82 so that rod |82 is tlghtly connectedto shaft |68. A washer |94 and lock nut |96 locks set screw |92 inplace. Vertical bore |64 is closed by a suitable plug |98 having a seal200 inserted in a recess 202 thereof which permits ample rightward andleftward shifting of rod |82.

A pin 204 (Figure 2) threaded into a bore 206 which extendsfrom theright side of block I2 to bore |66 fits into groove |80 of shaft |68preventing horizontal movement thereof but leaving shaft |68 free torotate within bore |66. A dial 208 (Figure 3) connected to shaft |68permits manual operation of control valve 30. Due to the fact that cam|10 is located on shaft |68 between dial 208 and the face of panel |0,suitable dogs connected to a reversible fluid motor or to a machinetool(not shown) may easily contact It should be noted that control valve 30is comy pletely shiftable within bore |4 of block |2 by the arrangementof having rotatable shaft |68 at right angles to control valve 38 andconnecting said shaft to said valve by means of rod |82. Thus, byrotating dial 288 or by rotating cam I18, the rod |82 will shift valve38 leftwardly or rightwardly depending upon clockwise orcounterclockwise rotation of dial 288 or cam |18. Referring to Figure 6,as dial 288 is rotated a detent 2I 8 backed by a spring 2I2 is forcedinto successive shallow recesses 2I4 in number equal to the plurality ofpositions of control valve 38.

In Figure 1, there is shown a control valve 88 of the open-center typeshiftably mounted within bore I4. Control valve 38 ls comprised of aspool 2I6 having a groove 2I8 located between an end land 228 and a land222, a groove 224 located between land 222 and a larger land 226, and agroove 228 located between land 2,26 and a land 238 of largerproportions than land 226. A longitudinal bore 232 extends from the leftend of spool 2I6 to a point between lands 226 and 238. Longitudinal bore232 is in communication with a plurality of transverse ports 284 locatedbetween lands 228 and 222 and also in communication with a plurality oftransverse ports 236 located between lands 228 and 288` Bore 232 isclosed at its open end by a suitable plug 238.

In order to show more clearly the different positions of and the mannerin which spool 2I6 controls and directs the pressure fluid to and fromthe spaced ports along bore I4, control valve 38 is shown incorporatedin a schematic circuit in Figures 7, 8, 9 and 10. This circuit containsthe same elements in all of the figures mentioned but in Figure "I showsvalve 38 in a stopped position, in Figure 8 in a rapid return position,in Figure 9 in a feed position, and in Figure 10 in a rapid advanceposition. There is shown in the figures mentioned a tank 248 connectedto a iiuid pump 242 by a conduit 244. The pump 242 is connected to thepressure port I6 of control valve 38 by a conduit 245. The tank port 24of control 38 is connected to tank 248 by means of a conduit 248.

A reversible fluid motor 258 containing a shiftable piston 252 to whichis connected a piston rod 254 is connected from its rod end to motorport 28 by means of a conduit 258 while thel piston end thereof isconnected to motor port I8 by means of a conduit 258. A branch conduit268 connects conduit 256 to one side of the piston II2 of compensatingvalve 86. A conduit 262 connects compensating valve 86 and conduit 260to throttle 88 and a conduit 264 connects throttle 80 to motor port 22.A conduit 266 connects the opposite end of piston II2 of compensatingvalve 86 to tank port 2'4. For hydraulic actuation of control valve 38,a pilot valve 268 is connected to the right end of control valve 38 by aconduit 218, to the left end thereof by a conduit 212, to tank 248 by aconduit 214 and to the pump delivery conduit 246 by aubranch conduit216. A suitable relief valve 218 is incorporated in the pump deliveryconduit and is connected to tank 248 by means of an exhaust conduit 288.For proper shifting of control valve 38, the right and left ends thereofare connected to each other by a conduit 282. A plug 18 will be insertedin conduit 282 when control valve 38 is pilot valve operated.

Referring now to Figure 10, in operation and with control valve 38shifted completely to the left to a rapid advance position, pressureiiuid will be directed from pump 242 by means of delivery conduit 246 tothe pressure port I6 of control valve 38. Land 226 will block motor port28 from port I6 and fluid is directed by means of lands 222 and 226through the medium of groove 224 to port I8 and from such port'to thehead end of motor 258 by means of conduit 258 to shift piston 252.Discharging fluid from the rod end of motor 250 is conducted by means ofconduit 256 to port 28 at which point lands 226 and 238 will, throughthe medium of groove 228, direct the uid to tank port 24 from where itwill be conducted to tank 248 by means of conduit 248. Due to the factthat the head end of motor 258 is in direct communication with the pump242, and the rod or discharge end of said motor is in directcommunication with tank 248, the total displacement of pump 242 isutilized to cause a rapid advance movement of the motor.

Referring now to Figure 8, a rapid return movement of motor 258 iscaused by shifting valve 38 completely to the right. In this positionlands 222 and 226, through the medium of groove 224, will direct fluidfrom pump 242 to motor port 28 where it is conducted to the rod end ofthe motor by means of conduit 256. Dlscharging fluid from the head endof the motor will be directed to the tank 248 by means of conduit 258,port I8, groove 2I8, transverse port 234, longitudinal bore 232,transverse port 238, groove 228, port 24 and conduit 248. As in the caseof the rapid advance movement, a direct communication from the pump 242is made to one end of the motor, in this case, the rod end, and the headend is directly connected to tank 248 to utilize the completedisplacement of the pump to cause a rapid reverse movement of saidmotor.

Referring now to Figure 9, control valve 38 is shown shifted to the nextposition subsequent.

to rapid advance, namely, feed position. After piston 252 of motor 258has been shifted a predetermined distance during rapid advance movementthereof, shaft I68 is rotated to cause spool 2I6 to shift to theposition shown. Pressure fluid from pump 242 is directed by lands 222and 226 through the medium of groove 224 to port I8 from where it isconducted to the head endl of motor 258 by means of conduit 258.Discharging uid from the rod end of motor 258 is blocked at port 28 byland 226 and must flow to tank 248 by means of conduits 268, 262 and 264to port 22. Discharging uid will be regulated to a predetermined flow bythrottle 88 with the cooperation of compensating valve 86 in thewellknown manner. Pressure duid in excess of the -total displacement ofpump 242 reaching the head end of motor will be exhausted to tank 248 bymeans of relief valve 218 through exhaust conduit 288. The amount ofregulated ow discharging from the motor'through throttle 88 to port 22will be directed to tank 248 by means of lands 228 and 222 through themedium of groove 2I8 to transverse port 234, bore 232, transverse ports236 and groove 228, from which point, lands 226 and 238 will direct thefluid through port 24 to conduit 248, the latter carrying the iluid totank 248.

Referring now to Figure 7, control valve 38 ls shown shifted to astopped position. Control valve 38 being of the open-center type,pressure uid from pump 242 is directed from port I6 directly to tank248. Fluid is directed from port I6 to port I8 through the medium oflands 222 and 226 and groove 224 and from port I8 to groove 2I8,transverse port 234, bore 232, transverse port 236, groove 228, tankport 24 and conduit 248 to tank 248. It should be noted that in thisposition pressure port I6 ls in direct com- 9 munication with tank port24v so that the complete delivery of pump 242 is unloaded to tank 240 inorder to stop motor 250.' Land 222 is designed to permit communicationinthis position between groove 2I8 and groove 224 through the medium ofthe groove forming port I8.

The ports spaced along bore I4 are so spaced apart that control valvesof different form than control 30 may be shiftably mounted within saidbore to produce rapid advance, speed and rapid return movements and tostop said motor. However, where it is necessary to use a closed-centercontrol valve because of certain installation requirements, forinstance, the operation of a load device from a branch line in additionto motor .250 while motor 250 is Istopped, a control valve of this typemay be shiftably mounted in bore I4 in exactly the same manner ascontrol valve to produce the same movements, of the motor as valve 30except that the motor 250 will be stopped by blocking ow of pressurefluid at port I6. For this purpose, there is shown in Fig- I ure 11 aclosed-center type of control valve 30' of slightly different form thancontrol valve 30. A land 222' of much greater length than thecorresponding land 222 of control valve 30 is spaced much closer to aleft end land 220' than is land 222 from land 220 of control valve 30. Aland 226' corresponding to land 226 of control valve 30 is of slightlygreater length than land 226 and a corresponding groove 224' betweenlands 226' and 222' is smaller than groove 224 of control valve 30. Y

The control valve 30' is'provided witha land 228 and 230' identical tolands 220 and 230 of control valve 30 and transverse ports 234' and 236'connected by a bore 232' of the same size and approximate location ofthe corresponding ports and bore of'control valve 38. Control valve 30'is mounted and shiftable to the same positions in identically the samemanner as control valve 30 except for one position thereof shown inFigure 11` In the stopped position fluid iiow from pump 242 enteringport I6 will be blocked from communication with all other ports spacedalong bore I4 by means of lands 222 and 226'.

i l0 I8 to both motor ports I9 and 20 so as to provide a differentialadvance movement of motor |50.

It should be noted that the identical shaft |88 is connected to allthree control valves in identically the same manner and that theshifting of said control valves results from the rotation of said shaft.Shaft |89 may be rotated manually from either the front or from the rearof the panel, although it can be clearly seen that the most practicalmethod is from the front. It can also be seen that by having dogsconnected to a machine toll driven by the motor contact switches, aftera certain length of travel in either direction of the piston of themotor, so as to energize or de-energize one or more solenoids connectedin the well-known manner to shaft |68, that several variations ofcombination manual and automatic shifting of the control valves arepossible.

For example, one method of shifting the control valves would be for theoperator to manually shift the control valve in use to a rapid advancefrom the stopped position. After a certain predetermined range of travelof the machine tool, a dog connected to the machine tool would contactthe cam to shift the control valve to a feed position. After a certainrange of travel in the feed position. a second dog on the same plane asthe first dog would contact the cam to shift the control valve to thestopped position. The operator would then manually shift the controlvalve to rapid reverse position and after a certain range of travel athird dog, on a different plane than the first or second dog, wouldcontact the cam to rotate shaft |68 in the other direction so astofshift the control valve again to the stopped position.

Another method would be to have the operator manually shift the controlvalve from the stop position to a rapid advance position and after acertain range of movement a dog connected to the machine tool wouldcontact the cam to shift the control valve to a feed position.

At the close of the feed movement, a second dog When a reversible iiuidmotor of the cylinder f and unbalanced piston type is used in thetransmission, it may be desirable to have a differential rapid advancemovement of said motor. Accordingly, a control valve of a third type.may be shiftably mounted in bore I4 in identically the same manner ascontrol valves 30 and 30.

Referring now to Figure 12, there is shown a differential control valve`30" having a groove 2I8" between an end land 220 and a land 222", agroove 224" between land 222" and a center land 226", a groove 221between land 226" and a land 229, and a groove 228" between land 229 andan end land 230". Control valve 30" is also provided with transverseport 234" betweeln lands 220" and 222" and transverse ports 238" betweenlands229 and 230", said ports being in communication with each other bya longitudinal bore 232". similar to control valve 30 except for anadditional center land 229 which forms an additional groove 221. Also,land 238" is longer in length than that of land 230 of control valve 30.Convtrol valve 39" will direct and control pressure iluid from pump 242to and from the ports Control valve 30" is somewhat spaced along bore I4in exactly the same manner l Awould contact fa switch to energize asolenoid to shift the control valve to rapid reverse position. At theend of the rapid reverse movement, another dog would contact the cam toshift the control valve to the stopped position.

Another methodwould be to use an additional solenoid which would beenergized at the end of a rapid reverse movement in order to immediatelyshift the control valve into rapid advance without a stop being made.The complete cycle of rapid advance, feed and rapid Y reverse would becontinuous and automatic until the motor was stopped and started againmanually by the operator.

It should be' noted that achange of control valves may be made withoutchanging any of the connections or removing the panel from its mountingsupport simply by removing plug |98, lock nut |99, washer |94, set screw|92, and the rod |82. The control valve may then be removed from eitherside of the panel by removing eitherof the plugs 28 or 28. It shouldalso be noted that these elements may be removed and replaced easily foruse with an alternative control valvev from the front, side and top ofthe panel.

Whilethe form of embodiment of the invention as'herein disclosedconstitutes a preferred form, it is to be understood that other formsmight be adopted, all coming within the scope of the claims whichfollow.

What is claimed is as follows:

1. A unitary control panel for use in a hydraulic transmissioncontaining a uid pump and double-acting hydraulic motor to give rapidadvance, feed and rapid return movements to and for stopping said motor,said panel comprising in combination a valve block having externalconnection ports including pressure and exhaust ports and a pair ofmotor ports, means in the block for limiting fluid oW to a predeterminedadjustable feed rate and a single valve in said block, said block havingvalve ports including a pair of motor ports, a pressure port between themotor ports, an exhaust port adjoining one of the motor ports and a rstport adjoining the other motor port and means connecting each externalport with each corresponding valve port and connecting the flow limitingmeans to one of the motor ports and to the rst valve port, whereby a rstshiftable valve member having means to connect the valve pressure portto the valve exhaust port will stop the motor and a second shiftablevalve member of different form having means to block the valve pressureport from communication with all other ports will stop the motor, saidvalve ports cooperating with the rst and second Valve members to providerapid advance, feed and rapid return action.

2. A unitary control panel for use in a hydraulic transmissioncontaining a fluid Ipump 'and double-acting hydraulic motor to giverapid advance, feed and rapid return movements to and for stopping saidmotor, said panel comprising in-combination a valve block havingexternal connection ports including pressure 'and exhaust ports and apair of motor ports, means in the block for limiting fluid flow to apredetermined adjustable feed rate, a single valve in said block, saidblock having valve Iports including a pair of motor ports, a pressureport between the motor ponts, an exhaust port adjoining one of the motorports and a first port adjoining the other motor port` means connectingeach external lport with each corresponding valve port and -connectingthe flow limiting means to one of the motor ports and -to the rst valveport, whereby a first shiftable valve member having means to connect thevalve pressure port to the valve exhaust port -Will stop the motor and asecond shiftable valve member of different form having means to blockthe valve pressure port from communication with all other ports willstop the motor, said valve ports cooperating with the rst and secondvalve members to -provide rapid advance, feed and rapid return action,means for actuating the valve members manually, means for actuating thevalve members mechanically, and means for actuating the valve membershydraulically.

3. A unitary control panel for use in a hydraulic transmissioncontaining a fluid pump and doubleacting hydraulic motor. to give rapidadvance, feed and rapid return movements to and for stopping said motor,said panel comprising in combination a valve block having externalconnection ports inclu-ding pressure and exhaust ports and a pair ofmotor ports, an adjustable throttle through which uid is adapted to flowat a regulated rate and a compensating valve for maintaining a conistant pressure drop across the throttle mounted in series in lthe blockfor producing a feed rate,

and a single valve in s-aid block, said block having valve portsincluding a pair of motor ports, a pressure port between the motorports, an exhaust port adjoining one of the motor yports and a iirstport adjoining the other motor port, and means connecting each externalport with each corresponding valve port and connecting the throttle andthe compensating valve to one of the motor ports and to the first valveport and connecting the compensating valve Ito the exhaust port, wherebya first shiftable valve member having means to connect the valvepressure port to the valve exhaust port `will stop the motor and asecond shiftable valve member of different form having means to blockthe valve pressure port from communication with all other ports willstop the motor, said valve ports cooperating with the first and ysecondvalve members to provide rapid advance, feed and rapid return action.

4. A unitary control panel for use in a hydraulic transmission`containing a uid pump and doubleacting hydraulic motor to give rapidadvance, feed and rapid return movements to and for stopping said motor,said -panel comprising in combination a valve block having externalconnection ports including pressure and exhaust ports and a pair ofmotor ports, means in the block for limiting fluid flow to apredetermined adjustable feed rate and a single valve in said block,said block having valve ports including a pair of motor ports, apressure port between the motor ports, an exhaust port vadjoining one ofthe motor ports and a first port adjoining the other motor port, andmeans connecting each external port with each corresponding valve portand connecting the flow limiting means to one of the motor ports and tothe first valve port, whereby a first shiftable valve member havingmeans to yconnect the valve pressure port to the valve exhaust port willstop the motor, a second shiftable valve member of different form havingmeans to block the valve pressure port from communication with all othervalve ports will stop the motor and -a third shift- 'able valve memberof still another different form willconnect the valve pressure port toboth valve motor ports to provide |a dierential rapid advance movement,said valve ports cooperating with the first and second valve members toprovide non-differential rapid advance, feed and rapid return movementsand cooperating with the third valve member to provide, in addition tothe dierential rapid advance action in the same manner of cooperation aswith the rst valve, a feed, rapid return and stop action.

5. A unitary control panel for use in a hydraulic transmissionycontaining a fluid vpump and double-acting hydraulic motor to giverapid ad- Vance, feed and rapid return movements to and for stoppingsaid motor, said panel comprising in combination a valve block havingexternal connection ports including pressure and exhaust ports and apair of motor ports, means in .the block for limiting iiuid flow to apredetermined adjustable feed rate, a single valve in said block, saidblock having valve ports including a pair of motor ports, a pressureport between the motor ports. an exhaust port adjoining one of the motorports and a rst port adjoining the other motor port, means connectingeach external port with each corresponding valve port and connecting theflow limiting means to one of the motor ports and to the first valveport, whereby a iii-st shiftable Y valve member having means to connectthe valve different form having means to block the valve pressure portfrom communication with all other valve ports will stop the motor and athird shiftable valve member of still 'another different form willconnect the valve press-ure port to Iboth valve motor ports to provide adifferential rapid advance movement, said valve ports cooperating withthe first and second valve members to provide non-differential rapidadv-ance, feed and rapid return movements and cooperating with the thirdvalve member to provide, in addition to the differential rapid advanceaction in the same manner of'cooperation as with the first valve, afeed, rapid return and stop action, means for actuating the valvemembers hydraulically, means for actuating the valve members manually,and means for mechanically actuating the valve members.

6. A unitary control panel for use in a hydraulic transmissioncontaining a fluid pump and double-acting hydraulic motor to give rapidadvance, feed and rapid return movements to and for stopping said motor,said panel comprising in combination a valve block having externalconnection ports including pressure and exhaust ports and a pair ofmotor ports, an adjustable throttle through which fluid is adapted toflow at a regulated rate and a compensating valve for maintaining aconstant pressure drop across the throttle mounted in series in theblock for producing a feed rate and a single valve in said block, saidblock having valve ports including a pair of motor ports,l a pressureport between the motor ports, an exhaust port adjoining one of the motorports and a first port adjoining the other motor port, and meansconnecting each external port with each corresponding valve port andconnecting the throttle and compensating valve to one of the motor portsand to the first valve port, and connecting the compensating valve tothe valve exhaust port, whereby a first shiftable valve member havingmeans to connect the valve pressure port to the valve exhaust port willstop the motor, a second shiftable valve member of different form havingmeans to block the valve pressure port from communication with all othervalve ports Will stop the motor and a third shiftable valve member ofstill another different form will connect the valve pressure port toboth valve motor ports to provide a differential rapid advance movement,said valve ports cooperating with the rst and second valve members tovprovide non-differential rapid advance, feed and rapid return movementsand cooperating with the third valve member to provide, in addition tothe differential rapid advance action in the same manner of cooperationas with the first valve, a feed. rapid return and stop action.

draulic transmission containing a fluid pump 14 and fluid motor forcontrolling the action of the motor comprising in combination a valveblock, said block having a longitudinal valve bore, ports spaced apartfrom each other along the bore including two ports for the admission ofpressure fluid to either end of the bore, external connection portsconnected to the valve bore ports and a transverse bore extendingcompletely through said block, a valve member for controlling the valveports shiftably mounted completely within the longitudinal bore, a shaftrotatably mounted in the transverse bore, at least one end of whichextends from the valve block, means connecting the shaft to the valvemember for shifting of the valve member upon rotation of the shaft, andmeans at an end of the shaft for connecting to the shaft a memberadapted to be operated manually and a member adapted to be operatedmechanically, whereby said valve member may be shifted manually,mechanically and hydraulically to control the action of the motor.

8. A unitary control panel for use in a hydraulic transmissioncontaining a fluid pump and uld motor for controlling the action of themotor comprising in combination a valve block, said block having alongitudinal valve bore, ports spacedapart from each other along thebore including two ports for the admission of pres-I sure fluid toeither end of the bore, external connection ports connected to the valvebore ports and a transverse bore extending completely through saidblock, a valve member for controlling the valve ports shiftably mountedcompletely within the longitudinal bore, a shaft rotatably mounted inthe transverse bore, both ends of which extend from the valve block,means connecting the shaft to the valve member for shifting of` thevalve member upon rotation of the shaft, means at the ends of the shaftfor connecting thereto a member adapted to be operated manually, andmeans at the ends of the shaft for connecting thereto a member adaptedto be operated mechanically, whereby said valve member may be shiftedmanually and mechanically from the front and the rearggf the panel andhydraulically to control the action of the motor.

DUNCAN B. GARDINER. BERNARD L. READMAN.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PAI'ENTS Number Name Date 1,931,048 Wiener Oct. 17, 19332,025,244 Morehead et al. Dec. 24, 1935 Twyman Dec. 23, 1941

